1. CSCI 3133 Programming with C Instructor: Bindra Shrestha University of Houston – Clear Lake

2. Computer Software 1. System Software Operating System 2. Application Software General-purpose software-word processors, database management systems Application Specific Software-ledger system used by accountants 2

3. Computing Environments 1. Personal Computing Environment A Personal Computer 2. Time-Sharing Environment Many users are connected to one or more computers in shared environment. 3. Client/Server Environment Splits the computing function between a central computers and users’ computers 3

4. Computer Languages Machine Language - 1940s streams of 0s and 1s. Program 1-1 pg.7 Grace Hopper developed symbolic language in1950s which mirrored the machine language, uses symbols As assembler translates symbolic language into a machine language, they soon became Assembly Language. Program 1-2 pg 8. 4

5. Computer Languages High -Level Languages -1960s must be converted to machine language, the process is known as compilation FORTRAN,COBAL,C 5

6. Building a C Program 6

7. 1. Writing and Editing Programs 2. Compiling the Program 3. Linking the program with library modules 7

8. Program Development 1. Understand the problem 2. Develop a solution 3. Write the program 4. Test the program 8

9. Tools to develop the solution 1. Structure Chart -shows how a problem can be broken into logical steps. figure 1-12, pg 15 2. Pseudocode -steps to accomplish the task in English-like statements 3. Flowchart- steps to accomplish the task in graphical symbols 9

10. Flowchart Symbols Oval : Denotes begin or End Flow line(arrow): direction of logical flow Parallelogram: denotes input/output operation Rectangle : denotes a process Diamond: denotes a decision point (if/then/else) 10

11. Example Calculate the Area of a Rectangle 1. Prompt the user for length and width 2. Store length and width 3. Set Area=length*width 4. Return Area 11

12. Example of Flowchart. 12 Begin Prompt user length and width Read length,width Area = length*width X

13. Flowchart contd.. 13 X Display area to user End